Probabilistic Life-Cycle Management Framework for Ship Structures Subjected to Coupled Corrosion–Fatigue Deterioration Processes

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Journal of Structural Engineering

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Fatigue and corrosion are two major deterioration mechanisms of ship structures. These mechanisms can lead to a reduction of structural safety. When occurring simultaneously, corrosion can exacerbate fatigue crack growth by (1) altering the material property related to fatigue crack and (2) increasing the stress range due to cross-sectional loss. Therefore, to ensure adequate functionality of ship structures, effective life-cycle management, including timely inspections and appropriate repair actions, should consider these two major deterioration mechanisms as well as their coupled effects. In this paper, a probabilistic management framework is proposed for ship structures under coupled corrosion–fatigue deterioration processes. Various uncertainties arising from material properties, coupled corrosion–fatigue modeling, loading conditions, and inspection techniques are considered in the proposed framework. The detrimental effects of corrosion on fatigue crack growth are taken into account in life-cycle optimization of inspection/repair actions. It is found that the effects of corrosion on fatigue can significantly affect the results of the optimal life-cycle management strategy and, therefore, must be properly incorporated in the planning of life-cycle maintenance actions.


*At the time of publication, David Yang was affiliated with Lehigh University.



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